2 Layers Of Roof Sheathing

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2 layers of roof sheathing.

Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage. It s usually a peel and stick product that adheres directly to the roof deck. Should you sandwich roof sheathing between two impermeable layers. Poor ventilation from a past roof along with 3 ply equals that delamination.

Most building codes allow for two layers of asphalt shingles on a house so stripping off everything down to the plywood sheathing may not be your only choice. Wood shakes minimum 3 4 sheathing wood shakes nail type minimum length. Roof deck is the roofing material that sits on top of the roof trusses. So anywhere along the gable end that you can see the felt you ll see two layers.

And if you re still wondering what roof sheathing is and what materials are typically used read on and satisfy your curiosity. Dimensional comp shingles over 3 tab 1 1 4 1 1 2 1 1 2 1 1 2 more than 1 layer of roofing not recommended over 3 8 sheathing. Plywood used for roof decking is typically called sheathing and carries a grade stamp indicating its load and span ratings and other performance factors. Plywood is layers of wood.

Skinning over old sheathing does occur but i have never seen someone skin over plywood in that condition. Comes in standard 4 by 8 foot sheets is strong. I m not a fan of spray foam. Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course.

The first course starts with an extra 1 2 wide run. Based on the pictures alone i don t know what to say. I am replacing a roof right now built in 1982 and the 3 ply is delaminated pretty heavily. It got nailed over 2 x 12 joists 24 o c.

Can you double up plywood roof sheathing without inviting disaster 2000 sf of 1 2 cdx ply went on the roof before i had a chance to take a look at it and it is really sorry stuff. Most roof decking is made from sheets of plywood. It s up to you. Water shield is the next roofing layer that creates a water proof barrier where ice or water can buildup near the roof eaves.